The JL was initially powered by engines from Alfa Romeo, Panhard, and other suppliers.

In 1961, it adopted a revised front with double head lamps[2] and was fitted with the Fulgur diesel engines[1] assembled at the Limoges factory, which would become part of Saviem.

In 1963, as part of Saviem's agreements, some JL models incorporated MAN engines, changing its denomination and forming the new JM range.

When built by Somua, the JL was offered with a variety of engines, including Renaults, Henschels and Alfa Romeos.

[1][3] The JL was replaced by the Saviem JM in 1964, with a more modern design and more powerful engines.